package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
  public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();

  @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
     //     A. 获取本次请求的URI
        String requestURI = request.getRequestURI();
        // B. 判断本次请求, 是否需要登录, 才可以访问
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
                // 全部放行
              //  "/**"

        };

      // C. 如果不需要，则直接放行
      boolean check = check(urls, requestURI);
      if(check){
          filterChain.doFilter(request,response);
          log.info("本次请求{}不需要处理",requestURI);
          return;
      }
      if(request.getSession().getAttribute("user") != null){
          log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

          Long userId = (Long) request.getSession().getAttribute("user");
          BaseContext.setCurrentId(userId);

          filterChain.doFilter(request,response);
          return;
      }
  //  D. 判断登录状态，如果已登录，则直接放行
      HttpSession session = request.getSession();
      Object el = session.getAttribute("employee");
      if(el!=null){

          Long mip = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(mip);
          log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
          filterChain.doFilter(request,response);
          return;
      }
      // E. 如果未登录, 则返回未登录结果
      PrintWriter writer = response.getWriter();
      writer.write(JSON.toJSONString(R.error("NOTLOGIN")));
      return;
  }

    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }

    return false;
    }
}
